What is the difference between evolutionary computation and evolutionary algorithms?
As you can find here:


  Evolutionary algorithms form a subset of evolutionary computation in that they generally only involve techniques implementing mechanisms inspired by biological evolution such as reproduction, mutation, recombination, natural selection, and survival of the fittest.


It means, other types of evolutions, which are not necessarily a biological evolution, are in EC, but not in EA. For example, Learning classifier system is in EC as it is evolutionary, but not completely in EA as it is not biological.